Systems and methods for optimizing user equipment assistant conditional handover
By enabling user equipment to report handover configuration information, the system optimizes conditional handover procedures, addressing inefficiencies and failures in multi-connectivity scenarios, thereby enhancing handover efficiency and resource utilization.
Patent Information
- Application Number
- PCT/CN2024/085995
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-04-03
- Publication Date
- 2025-07-31
AI Technical Summary
Existing wireless communication systems face challenges in optimizing conditional handover procedures for user equipment, particularly in multi-connectivity scenarios, leading to inefficient resource allocation and potential handover failures due to sub-optimal timer settings and unsuitable handover configurations.
The system enables user equipment to report handover configuration information to the network, including threshold percentages for timers associated with master and secondary nodes, measurement results, and execution conditions, allowing the network to adjust timer values and optimize handover configurations based on these reports.
This approach enhances mobility robustness by improving handover efficiency, reducing resource wastage, and minimizing handover failures by allowing the network to dynamically adjust timer settings based on real-time conditions and UE reports.
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Figure CN2024085995_31072025_PF_FP_ABST
Abstract
Description
SYSTEMS AND METHODS FOR OPTIMIZING USER EQUIPMENT ASSISTANT CONDITIONAL HANDOVERTECHNICAL FIELD
[0001] The disclosure relates generally to wireless communications, including but not limited to systems and methods for optimizing user equipment assistant conditional handover.BACKGROUND
[0002] Coverage is a key consideration in cellular network deployments. With the rise of interconnected devices, there is a growing focus on effective device communication. The current 3GPP standards, spanning from 3G to 5G and beyond, focus on the importance of seamless communication among various devices, from smart home devices to wearable devices. In industrial settings, the complexity of tasks often requires collaboration. This calls for several cooperative operational management systems, with the aim of creating workgroups and managing different types of devices to complete the required tasks.SUMMARY
[0003] The example embodiments disclosed herein are directed to solving the issues relating to one or multiple of the problems presented in the prior art, as well as providing additional features that will become readily apparent by reference to the following detailed description when taken in conjunction with the accompany drawings. In accordance with various embodiments, example systems, methods, devices and computer program products are disclosed herein. It is understood, however, that these embodiments are presented by way of example and are not limiting, and it will be apparent to those of ordinary skill in the art who read the present disclosure that various modifications to the disclosed embodiments can be made while remaining within the scope of this disclosure.
[0004] At least one aspect is directed to a system, method, apparatus, or a computer-readable medium. Awireless communication device (e.g., UE) can receive / acquire / obtain report configuration information from a network. The wireless communication device can send / transmit / provide a report regarding a conditional handover procedure based on the report configuration information to the network. In certain implementations, the report configuration information can indicate a threshold percentage of a timer. In certain implementations, the threshold percentage of the timer can be associated with a master node (MN) , a secondary node (SN) , or both the MN and SN.
[0005] In certain implementations, the report can include at least one of the following: measurement results for neighboring cells; a cell ID of a source MCG or SCG when performing a handover or cell change procedure; a cell ID of a target MCG or SCG when performing a handover or cell change procedure; and / or an amount of time elapsed from initiation of a last conditional reconfiguration execution towards a target cell and reception of the latest conditional reconfiguration for the target cell.
[0006] In certain implementations, when a ratio of the amount of elapsed time associated with the MN to a configured value of the timer associated with the MN is greater than the threshold percentage of the timer associated with the MN, the report can include an indication of the MN. In certain implementations, when a ratio of the amount of elapsed time associated with the SN to a configured value of the timer associated with the SN is greater than the threshold percentage of the timer associated with the SN, the report can include an indication of the SN.
[0007] In certain implementations, the report can include a list of candidate target cells for the conditional handover procedure with one or more SCGs. In certain implementations, the report can include an indication of whether one or more execution conditions associated with each cell have been met / satisfied for each candidate cell. In certain implementations, the report can further include one or more execution conditions associated with a PCell and one or more execution conditions associated with a PSCell.
[0008] In certain implementations, the report can include a PSCell ID, the PSCell ID indicate at least one of the following: the PSCell in which the UE failed to perform fast MCG recovery procedure; the PSCell in which the UE successfully performed fast MCG recovery procedure; the PSCell in which the RLF is detected; the PSCell in which the target PSCell of the failed handover; the PSCell to which UE is connected when the RLF or failed handover is detected in the PCell; the PSCell in which the target PSCell of the successful handover or no RLF.
[0009] In certain implementations, the report can further include a measurement results for neighboring cells of the PSCell ; or the failure cause of the PSCell; or the successful indication of the PSCell.
[0010] In certain implementations, the report can further include a container of SCGFailureInformation message which is used to provide information regarding SCG failures detected by the UE.
[0011] In certain implementations, the report can include a list of candidate target PCells and PSCells, each candidate target PCell is associated to one or more candidate target PSCells. In certain implementations, for each set of {PCell + PSCell} in the candidate cell list, if any of candidate cell meets the execution condition, the UE can indicate whether the execution condition (s) are met for each candidate cell, or the report can include a list of candidate target PCells or PSCells which meets the execution condition.
[0012] In certain implementations, when an execution condition associated with a PCell or associated with a PSCell is fulfilled while detecting a link failure: the wireless communication device sending an indication of the PCell if an execution condition associated with the PCell is fulfilled first to the network; or the wireless communication device sending an indication of the PSCell if an execution condition associated with the PSCell is fulfilled first to the network.
[0013] In certain implementations, when an execution condition associated with a PCell is fulfilled at a first time point: the wireless communication device sending an amount of elapsed time between the first time point and reception of a last conditionalReconfiguration message to the network. In some implementations, the last conditionalReconfiguration message can include the execution condition associated with the PCell. In certain implementations, when an execution condition associated with a PSCell is fulfilled at a second time point, the configuration / arrangement can further include the wireless communication device sending an amount of elapsed time between the second time point and reception of a last conditionalReconfiguration message to the network. In some implementations, the last conditionalReconfiguration message can include the execution condition associated with the PSCell.
[0014] In certain implementations, when one or more execution conditions associated with a PCell and one or more execution conditions associated with a PSCell are both fulfilled at a third time point, the configuration / arrangement can further include the wireless communication device sending an amount of elapsed time between the third time point and reception of a last conditionalReconfiguration message to the network. In some implementations, the last conditionalReconfiguration message can include the execution conditions associated with the PCell and the PSCell. In certain implementations, when one or more execution conditions associated with a PCell are fulfilled at a first time point and one or more execution conditions associated with a PSCell are fulfilled at a second time point, the configuration / arrangement can further include the wireless communication device sending an amount of elapsed time between the first time point and the second time point to the network.
[0015] In certain implementations, the wireless communication device can receive UEInformationRequest from the network. In some implementations, the UEInformationRequest can include at least one of the following: a list of PCells and PSCells that are available for performing the conditional handover procedure with an SN; an evaluation condition used for both candidate PCells and PSCells; a first evaluation condition used for a candidate PCell; a second evaluation condition used for a candidate PSCell; and / or a third evaluation condition used for a dedicated candidate PCell list or PSCell list.
[0016] In certain implementations, the wireless communication device can determine whether any of the evaluation conditions have been met / satisfied. In some implementations, the report can include a candidate PCell and / or PSCell that has the corresponding evaluation condition met / satisfied.
[0017] In certain implementations, the system of the technical solution disclosed herein can support performing mobility robustness optimization for wireless communication, especially when the UE performs a conditional handover with a secondary cell group, according to at least one of the following example configurations (e.g., features or solutions) :
[0018] ● Example configuration 1: Report Configuration Reception
[0019] ● Example configuration 2: SRR Report Content
[0020] ● Example configuration 3: Timer Threshold Reporting
[0021] ● Example configuration 4: Failure Case and Request Case-1 Reporting
[0022] ● Example configuration 5: Request Case-2 ReportingBRIEF DESCRIPTION OF THE DRAWINGS
[0023] Various example embodiments of the present solution are described in detail below with reference to the following figures or drawings. The drawings are provided for purposes of illustration only and merely depict example embodiments of the present solution to facilitate the reader’s understanding of the present solution. Therefore, the drawings should not be considered limiting of the breadth, scope, or applicability of the present solution. It should be noted that for clarity and ease of illustration, these drawings are not necessarily drawn to scale.
[0024] FIG. 1 illustrates an example cellular communication network in which techniques disclosed herein may be implemented, in accordance with an embodiment of the present disclosure;
[0025] FIG. 2 illustrates a block diagram of an example base station and a user equipment device, in accordance with some embodiments of the present disclosure; and
[0026] FIG. 3 illustrates a flow diagram of an example method for optimizing user equipment assistant conditional handover, in accordance with an embodiment of the present disclosure.DETAILED DESCRIPTION
[0027] 1. Mobile Communication Technology and Environment
[0028] FIG. 1 illustrates an example wireless communication network, and / or system, 100 in which techniques disclosed herein may be implemented, in accordance with an embodiment of the present disclosure. In the following discussion, the wireless communication network 100 may be any wireless network, such as a cellular network or a narrowband Internet of things (NB-IoT) network, and is herein referred to as “network 100. ” Such an example network 100 includes a base station 102 (hereinafter “BS 102” ; also referred to as wireless communication node) and a user equipment device 104 (hereinafter “UE 104” ; also referred to as wireless communication device) that can communicate with each other via a communication link 110 (e.g., a wireless communication channel) , and a cluster of cells 126, 130, 132, 134, 136, 138 and 140 overlaying a geographical area 101. In FIG. 1, the BS 102 and UE 104 are contained within a respective geographic boundary of cell 126. Each of the other cells 130, 132, 134, 136, 138 and 140 may include at least one base station operating at its allocated bandwidth to provide adequate radio coverage to its intended users.
[0029] For example, the BS 102 may operate at an allocated channel transmission bandwidth to provide adequate coverage to the UE 104. The BS 102 and the UE 104 may communicate via a downlink radio frame 118, and an uplink radio frame 124 respectively. Each radio frame 118 / 124 may be further divided into sub-frames 120 / 127 which may include data symbols 122 / 128. In the present disclosure, the BS 102 and UE 104 are described herein as non-limiting examples of “communication nodes, ” generally, which can practice the methods disclosed herein. Such communication nodes may be capable of wireless and / or wired communications, in accordance with various embodiments of the present solution.
[0030] FIG. 2 illustrates a block diagram of an example wireless communication system 200 for transmitting and receiving wireless communication signals (e.g., OFDM / OFDMA signals) in accordance with some embodiments of the present solution. The system 200 may include components and elements configured to support known or conventional operating features that need not be described in detail herein. In one illustrative embodiment, system 200 can be used to communicate (e.g., transmit and receive) data symbols in a wireless communication environment such as the wireless communication environment 100 of FIG. 1, as described above.
[0031] System 200 generally includes a base station 202 (hereinafter “BS 202” ) and a user equipment device 204 (hereinafter “UE 204” ) . The BS 202 includes a BS (base station) transceiver module 210, a BS antenna 212, a BS processor module 214, a BS memory module 216, and a network communication module 218, each module being coupled and interconnected with one another as necessary via a data communication bus 220. The UE 204 includes a UE (user equipment) transceiver module 230, a UE antenna 232, a UE memory module 234, and a UE processor module 236, each module being coupled and interconnected with one another as necessary via a data communication bus 240. The BS 202 communicates with the UE 204 via a communication channel 250, which can be any wireless channel or other medium suitable for transmission of data as described herein.
[0032] As would be understood by persons of ordinary skill in the art, system 200 may further include any number of modules other than the modules shown in FIG. 2. Those skilled in the art will understand that the various illustrative blocks, modules, circuits, and processing logic described in connection with the embodiments disclosed herein may be implemented in hardware, computer-readable software, firmware, or any practical combination thereof. To clearly illustrate this interchangeability and compatibility of hardware, firmware, and software, various illustrative components, blocks, modules, circuits, and steps are described generally in terms of their functionality. Whether such functionality is implemented as hardware, firmware, or software can depend upon the particular application and design constraints imposed on the overall system. Those familiar with the concepts described herein may implement such functionality in a suitable manner for each particular application, but such implementation decisions should not be interpreted as limiting the scope of the present disclosure.
[0033] In accordance with some embodiments, the UE transceiver 230 may be referred to herein as an “uplink” transceiver 230 that includes a radio frequency (RF) transmitter and a RF receiver each comprising circuitry that is coupled to the antenna 232. A duplex switch (not shown) may alternatively couple the uplink transmitter or receiver to the uplink antenna in time duplex fashion. Similarly, in accordance with some embodiments, the BS transceiver 210 may be referred to herein as a “downlink” transceiver 210 that includes a RF transmitter and a RF receiver each comprising circuity that is coupled to the antenna 212. A downlink duplex switch may alternatively couple the downlink transmitter or receiver to the downlink antenna 212 in time duplex fashion. The operations of the two transceiver modules 210 and 230 may be coordinated in time such that the uplink receiver circuitry is coupled to the uplink antenna 232 for reception of transmissions over the wireless transmission link 250 at the same time that the downlink transmitter is coupled to the downlink antenna 212. Conversely, the operations of the two transceivers 210 and 230 may be coordinated in time such that the downlink receiver is coupled to the downlink antenna 212 for reception of transmissions over the wireless transmission link 250 at the same time that the uplink transmitter is coupled to the uplink antenna 232. In some embodiments, there is close time synchronization with a minimal guard time between changes in duplex direction.
[0034] The UE transceiver 230 and the base station transceiver 210 are configured to communicate via the wireless data communication link 250, and cooperate with a suitably configured RF antenna arrangement 212 / 232 that can support a particular wireless communication protocol and modulation scheme. In some illustrative embodiments, the UE transceiver 210 and the base station transceiver 210 are configured to support industry standards such as the Long Term Evolution (LTE) and emerging 5G standards, and the like. It is understood, however, that the present disclosure is not necessarily limited in application to a particular standard and associated protocols. Rather, the UE transceiver 230 and the base station transceiver 210 may be configured to support alternate, or additional, wireless data communication protocols, including future standards or variations thereof.
[0035] In accordance with various embodiments, the BS 202 may be an evolved node B (eNB) , a serving eNB, a target eNB, a femto station, or a pico station, for example. In some embodiments, the UE 204 may be embodied in various types of user devices such as a mobile phone, a smart phone, a personal digital assistant (PDA) , tablet, laptop computer, wearable computing device, etc. The processor modules 214 and 236 may be implemented, or realized, with a general purpose processor, a content addressable memory, a digital signal processor, an application specific integrated circuit, a field programmable gate array, any suitable programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described herein. In this manner, a processor may be realized as a microprocessor, a controller, a microcontroller, a state machine, or the like. A processor may also be implemented as a combination of computing devices, e.g., a combination of a digital signal processor and a microprocessor, a plurality of microprocessors, one or multiple microprocessors in conjunction with a digital signal processor core, or any other such configuration.
[0036] Furthermore, the steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in firmware, in a software module executed by processor modules 214 and 236, respectively, or in any practical combination thereof. The memory modules 216 and 234 may be realized as RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. In this regard, memory modules 216 and 234 may be coupled to the processor modules 210 and 230, respectively, such that the processors modules 210 and 230 can read information from, and write information to, memory modules 216 and 234, respectively. The memory modules 216 and 234 may also be integrated into their respective processor modules 210 and 230. In some embodiments, the memory modules 216 and 234 may each include a cache memory for storing temporary variables or other intermediate information during execution of instructions to be executed by processor modules 210 and 230, respectively. Memory modules 216 and 234 may also each include non-volatile memory for storing instructions to be executed by the processor modules 210 and 230, respectively.
[0037] The network communication module 218 generally represents the hardware, software, firmware, processing logic, and / or other components of the base station 202 that enable bi-directional communication between base station transceiver 210 and other network components and communication nodes configured to communicate with the base station 202. For example, network communication module 218 may be configured to support internet or WiMAX traffic. In a typical deployment, without limitation, network communication module 218 provides an 802.3 Ethernet interface such that base station transceiver 210 can communicate with a conventional Ethernet based computer network. In this manner, the network communication module 218 may include a physical interface for connection to the computer network (e.g., Mobile Switching Center (MSC) ) . The terms “configured for, ” “configured to” and conjugations thereof, as used herein with respect to a specified operation or function, refer to a device, component, circuit, structure, machine, signal, etc., that is physically constructed, programmed, formatted and / or arranged to perform the specified operation or function.
[0038] The Open Systems Interconnection (OSI) Model (referred to herein as, “open system interconnection model” ) is a conceptual and logical layout that defines network communication used by systems (e.g., wireless communication device, wireless communication node) open to interconnection and communication with other systems. The model is broken into seven subcomponents, or layers, each of which represents a conceptual collection of services provided to the layers above and below it. The OSI Model also defines a logical network and effectively describes computer packet transfer by using different layer protocols. The OSI Model may also be referred to as the seven-layer OSI Model or the seven-layer model. In some embodiments, a first layer may be a physical layer. In some embodiments, a second layer may be a Medium Access Control (MAC) layer. In some embodiments, a third layer may be a Radio Link Control (RLC) layer. In some embodiments, a fourth layer may be a Packet Data Convergence Protocol (PDCP) layer. In some embodiments, a fifth layer may be a Radio Resource Control (RRC) layer. In some embodiments, a sixth layer may be a Non-Access Stratum (NAS) layer or an Internet Protocol (IP) layer, and the seventh layer being the other layer.
[0039] Various example embodiments of the present solution are described below with reference to the accompanying figures to enable a person of ordinary skill in the art to make and use the present solution. As would be apparent to those of ordinary skill in the art, after reading the present disclosure, various changes or modifications to the examples described herein can be made without departing from the scope of the present solution. Thus, the present solution is not limited to the example embodiments and applications described and illustrated herein. Additionally, the specific order or hierarchy of steps in the methods disclosed herein are merely example approaches. Based upon design preferences, the specific order or hierarchy of steps of the disclosed methods or processes can be re-arranged while remaining within the scope of the present solution. Thus, those of ordinary skill in the art will understand that the methods and techniques disclosed herein present various steps or acts in a sample order, and the present solution is not limited to the specific order or hierarchy presented unless expressly stated otherwise.
[0040] 2. Systems and Methods for Optimizing User Equipment Assistant Conditional Handover
[0041] In communication systems, the network can control mobility, which applies to UEs in RRC_CONNECTED. A conditional handover (CHO) can be defined as a handover that is executed by the UE when one or more handover execution conditions are satisfied. In certain implementations, the UE can start evaluating the execution condition (s) upon receiving the CHO configuration. In certain implementations, the UE can stop evaluating the execution condition (s) upon the execution of a handover. In certain implementations, the CHO configuration can include the configuration of CHO candidate cell (s) generated by the candidate base station (s) and the execution condition (s) generated by the source base station.
[0042] In certain implementations, the UE can perform a handover or cell change based on the CHO configuration. In some implementations, it can be desirable for the network to be informed whether the provided CHO configuration is suitable. For example, in this regard, the network can perform Mobility Robustness Optimization, which can be used to detect connection failures that occur due to handovers being too early or too late, or due to handovers to the wrong cell. When the CHO failure happens, the UE may store and report the failure information to the network.
[0043] In certain implementations, a successful CHO can indicate / reflect that the configuration is sub-optimal if the timer of T304 or T310 / T312 is running for an extended period of time. To analyze such sub-optimal successful CHO, the UE can collect successful handover reports based on the triggers configured by the network. In certain implementations, the trigger can occur when the ratio of the elapsed time to the configured value / duration of timer T310 (or T312 or T304) is greater than a configured / predefined threshold. Based on the report, the network can determine / decide whether to adjust T310 (or T312 or T304) timer values.
[0044] In certain implementations, where the UE is configured with multi-connectivity operations, similar CHO principles can be used for the configuration and execution of CHO for the master node (MN) and / or secondary node (SN) . In certain implementations, if the provided CHO with SCG configuration is not suitable, for example, when the evaluation condition (s) for MN and SN cannot be met / satisfied at the same time, the UE may not be able to perform CHO with SCG at any time, resulting in wasted resources prepared by the network.
[0045] In certain implementations, the SPR report can assist the network in determining whether the timers T304, T310, or T312 are appropriately / suitably set. For example, the UE can collect SPR reports based on the following trigger conditions such as whether the ratio of the elapsed time of a timer (such as T304, T310, or T312) to the configured value of the timer (such as T304, T310, or T312) is greater than a configured threshold percentage of the associated / corresponding timer. Based on the report, the network can optimize the CHO configuration and adjust T304 / T310 / T312 timer values accordingly.
[0046] In certain implementations, the SRR report can include at least one of the following: measurement results for neighboring cells; cell ID of the source MCG (Master Cell Group) or SCG (Secondary Cell Group) when performing a handover or cell change; cell ID of the target MCG or SCG when performing a handover or cell change; and / or time elapsed between the initiation of the last conditional reconfiguration execution towards the target cell and the reception of the latest conditional reconfiguration for the target cell.
[0047] In certain implementations, where the UE is configured with multi-connectivity operation and can perform CHO for the master node (MN) and / or secondary node (SN) , the network may encounter challenges upon receiving the SPR report from the UE. For example, upon receiving the SPR report from the UE, the network may not be able to determine whether the triggered condition has been satisfied for the MN node or the SN node. As a result, it may be difficult for the network to decide how to adjust the T310 (or T312 or T304) timer values based on the report.
[0048] In certain implementations, the network can use some enhancements to assist in adjusting CHO-related configurations and setting appropriate values for the T310 (or T312 or T304) timer. For example, in certain embodiments / implementations, the network can indicate that the configured / predefined threshold percentage of a timer (T304, T310, or T312) is associated with MN. If the ratio of the elapsed time of the timer T304 associated with MN to the configured value of the timer T304 is greater than the configured / predefined threshold percentage, the UE can send an SPR report. In certain embodiments / implementations, the network can indicate that the configured threshold percentage of the timer (T304, T310, or T312) is associated with SN. If the ratio of the elapsed time of the timer T304 associated with SN to the configured value of the timer T304 is greater than the configured / predefined threshold percentage, the UE can send an SPR report. In certain embodiments / implementations, the network can indicate that the configured / predefined threshold percentage of the timer (T304, T310, or T312) is associated with MN and SN. If the ratio of the elapsed time of the timer T304 associated with MN to the configured value of the timer T304 is greater than the configured / predefined threshold percentage and the ratio of the elapsed time of the timer T304 associated with SN to the configured value of the timer T304 is greater than the configured / predefined threshold percentage, the UE can send an SPR report.
[0049] In certain implementations, the configuration / arrangement details can be specified as follows:
[0050] Step 1: The UE can receive the report configuration information from the network. In certain implementations, the report configuration information can include at least one of the following:
[0051] ● The first indication, which can indicate that the configured threshold percentage of the timer (T304, T310, or T312) is associated with MN, SN, or both MN and SN.
[0052] ● The first threshold information, which can be the threshold percentage of the timer (T304, T310, or T312) and can be associated with MN.
[0053] ● The second threshold information, which can be the threshold percentage of the timer (T304, T310, or T312) and can be associated with SN.
[0054] ● The third threshold information, which can be the threshold percentage of the timer (T304, T310 or T312) and can be associated with both MN and SN.
[0055] Step 2a: After the UE receives the first indication set to MN and / or any threshold percentage information, or after the UE receives the first threshold information, if the ratio of the elapsed time of the timer T304 associated with MN to the configured value of the timer T304 is greater than the configured threshold percentage, the UE can send an SPR report.
[0056] Step 2b: After the UE receives the first indication set to SN and / or any threshold percentage information, or after the UE receives the second threshold information, if the ratio of the elapsed time of the timer T304 associated with SN to the configured value of the timer T304 is greater than the configured threshold percentage, the UE can send an SPR report.
[0057] Step 2c: After the UE receives the first indication set to both MN and SN and / or any threshold percentage information, or after the UE receives the third threshold information, if the ratio of the elapsed time of the timer T304 associated with MN to the configured value of the timer T304 is greater than the configured threshold percentage, and the ratio of the elapsed time of the timer T304 associated with SN to the configured value of the timer T304 is greater than the configured threshold percentage, the UE can send an SPR report.
[0058] Step 2d: After the UE receives the first indication set to MN, SN, and / or any threshold percentage information, if the ratio of the elapsed time of the timer T304 associated with MN or SN to the configured value of the timer T304 is greater than the configured threshold percentage, the UE can send an SPR report. In certain implementations, if the ratio of the elapsed time of the timer T304 associated with MN to the configured value of the timer T304 is greater than the configured threshold percentage, the SPR report can include the indication of MN. In certain implementations, if the ratio of the elapsed time of the timer T304 associated with SN to the configured value of the timer T304 is greater than the configured threshold percentage, the SPR report can include the indication of SN.
[0059] In certain implementations, when a UE is configured for one or more candidate target MCG cells associated with one or more candidate target SCG cells for multi-connectivity CHO operation, the configuration can be referred to as CHO with candidate SCG cells. In certain implementations, the UE can evaluate / validate / determine the conditions for the candidate target MCG cells and the associated candidate target SCG cells in parallel and can apply a target configuration that includes MCG cell and SCG cell for which the associated execution conditions can be fulfilled / satisfied.
[0060] In certain implementations, when a UE is configured for CHO with candidate SCGs, the UE can receive a ConditionalReconfiguration that may include a list of CondReconfig. In certain implementations, each CondReconfig can be associated with a CondReconfigId and may include condExecutionCond, condExecutionCondPSCell, and target candidate cell (s) , including PCell (SpCell of a master cell group) and PSCell (SpCell of a secondary cell group) information elements from the network. For example:
[0061] If the event (s) associated with all measId (s) , as indicated in the condExecutionCond and condExecutionCondPSCell, are fulfilled / satisfied, the UE can consider / determine the target candidate PCell as a triggered PCell and the target candidate PSCell as a triggered PSCell. In some implementations, the UE can initiate the execution of the conditional reconfiguration. In certain implementations, the SpCell can be the primary cell of a master or secondary cell group.
[0062] In certain implementations, where the conditions for the candidate target MCG cell (s) and / or the candidate target SCG cell (s) are met / satisfied, the UE can perform a multi-connectivity CHO operation. In some implementations, where the configuration is not suitable, the UE may not find that the conditions for candidate target SCG cell (s) and / or MCG cell (s) are satisfied / met at any time. For example, the conditions for one candidate target MCG cell can be met / satisfied at time-1, and the conditions for the associated candidate target SCG cell (s) can be met / satisfied at time-2, indicating that the conditions may not be satisfied at the same time.
[0063] In certain embodiments / implementations, when a radio link failure is detected for the MCG, the UE can store the radio link failure information in the VarRLF-Report and send the report to the network. In some implementations, for a CondReconfig that includes condExecutionCond and condExecutionCondPSCell, if the execution conditions indicated in the condExecutionCond or the condExecutionCondPSCell are fulfilled / satisfied at the moment the failure is detected, the UE can set an indication in the VarRLF-Report and send the report to the network. In some implementations, the indication can indicate / signify that the execution conditions indicated in the condExecutionCond or condExecutionCondPSCell have been fulfilled / satisfied.
[0064] In certain embodiments / implementations, if the execution conditions indicated in the condExecutionCond are fulfilled / satisfied first, the UE can set the indication of PCell in the VarRLF-Report and send the report to the network. In some implementations, if the execution conditions indicated in the condExecutionCondPSCell are fulfilled / satisfied first, the UE can set the indication of PSCell in the VarRLF-Report and send the report to the network.
[0065] In certain embodiments / implementations, if the execution conditions indicated in the condExecutionCond are fulfilled / satisfied at time point 1, and the execution conditions indicated in the condExecutionCondPSCell are fulfilled / satisfied at time point 2, the UE can send the elapsed time between time point 1 and time point 2 to the network.
[0066] In certain embodiments / implementations, if the execution conditions indicated in the condExecutionCond are fulfilled / satisfied at time point 1, the UE can send the elapsed time between time point 1 and the reception of the last conditionalReconfiguration message. In some implementations, the last conditionalReconfiguration can include the condExecutionCond information.
[0067] In certain embodiments / implementations, if the execution conditions indicated in the condExecutionCondPSCell are fulfilled / satisfied at time point 2, the UE can send the elapsed time between time point 2 and the reception of the last conditionalReconfiguration message. In some implementations, the last conditionalReconfiguration can include the condExecutionCondPSCell information.
[0068] In certain embodiments / implementations, if the execution conditions indicated in the condExecutionCondPSCell and condExecutionCond are fulfilled / satisfied at time point 3, the UE can send the elapsed time between time point 3 and the reception of the last conditionalReconfiguration message. In some implementations, the last conditionalReconfiguration can include the condExecutionCond and / or condExecutionCondPSCell information.
[0069] In certain implementations, the report can include a PSCell ID, the PSCell ID indicate at least one of the following: the PSCell in which the UE failed to perform fast MCG recovery procedure; the PSCell in which the UE successfully performed fast MCG recovery procedure; the PSCell in which the RLF is detected; the PSCell in which the target PSCell of the failed handover; the PSCell to which UE is connected when the RLF or failed handover is detected in the PCell; the PSCell in which the target PSCell of the successful handover or no RLF.
[0070] In certain implementations, the report can further include a measurement results for neighboring cells of the PSCell ; or the failure cause of the PSCell; or the successful indication of the PSCell.
[0071] In certain implementations, the report can further include a container of SCGFailureInformation message which is used to provide information regarding SCG failures detected by the UE.
[0072] In certain implementations, the UE can send the network a report which include a list of candidate target PCells and PSCells, wherein each candidate target PCell is associated to one or more candidate target PSCells. In certain implementations, for each set of {PCell + PSCell} in the candidate cell list, if any of candidate cell meets the execution condition, the UE can indicate whether the execution condition (s) are met for each candidate cell. For one example, for the set of PCell1 + PSCell2, if the execution condition (s) of PCell1 are met and execution condition (s) of PSCell2 are not met, the UE can report the indication of ‘01’ or ‘10’ for this set of {PCell + PSCell} . For another implementations, the report can include a list of candidate target PCells or PSCells which meets the execution condition.
[0073] In certain embodiments / implementations, the UE can send the network a list of candidate target cells, including candidate SCG cells, for conditional handover.
[0074] In certain embodiments / implementations, when radio link failure is detected for the SCG, the UE can set the following information in the SCG failure information and send the information to the network.
[0075] In some implementations, for a CondReconfig that includes condExecutionCond and condExecutionCondPSCell, if the execution conditions indicated in the condExecutionCond or condExecutionCondPSCell are fulfilled / satisfied at the moment the failure is detected, the UE can set the indication in the SCG failure information and send the information to the MN node. In certain implementations, the indication can indicate / signify that the execution conditions indicated in the condExecutionCond or condExecutionCondPSCell have been fulfilled / satisfied.
[0076] In certain embodiments / implementations, if the execution conditions indicated in the condExecutionCond are fulfilled / satisfied first, the UE can set the indication of PCell in the SCG failure information and send the information to the MN node. In certain implementations, if the execution conditions indicated in the condExecutionCondPSCell are fulfilled / satisfied first, the UE can set the indication of PSCell in the VarRLF-Report and send the report to the network.
[0077] In certain embodiments / implementations, if the execution conditions indicated in the condExecutionCond are fulfilled / satisfied at time point 1, and the execution conditions indicated in the condExecutionCondPSCell are fulfilled / satisfied at time point 2, the UE can send the elapsed time between time point 1 and time point 2 to the MN node.
[0078] In certain embodiments / implementations, if the execution conditions indicated in the condExecutionCond are fulfilled / satisfied at time point 1, the UE can send the elapsed time between time point 1 and the reception of the last conditionalReconfiguration message. In some implementations, the last conditionalReconfiguration can include the condExecutionCond information.
[0079] In certain embodiments / implementations, if the execution conditions indicated in the condExecutionCondPSCell are fulfilled / satisfied at time point 2, the UE can send the elapsed time between time point 2 and the reception of the last conditionalReconfiguration message. In some implementations, the last conditionalReconfiguration can include the condExecutionCondPSCell information.
[0080] In certain embodiments / implementations, if the execution conditions indicated in the condExecutionCondPSCell and condExecutionCond are fulfilled at time point 3, the UE can send the elapsed time between time point 3 and the reception of the last conditionalReconfiguration message. In some implementations, the last conditionalReconfiguration can include the condExecutionCond and / or condExecutionCondPSCell information.
[0081] In certain implementations, if the network wants to know / determine the CHO configuration and execution situation / status of the UE, the network can send the UEInformationRequest to retrieve information from the UE. In certain implementations, if the UE receives the UEInformationRequest from the network, the UE can send at least one of the following to the network: a candidate target cell list, including candidate SCGs for conditional handover; and / or CondReconfig that includes condExecutionCond and condExecutionCondPSCell.
[0082] In certain implementations, for a CondReconfig that includes condExecutionCond and condExecutionCondPSCell, if the execution conditions indicated in the condExecutionCond or condExecutionCondPSCell are fulfilled / satisfied at the moment the failure is detected, the UE can send an indication to the network. In some implementations, the indication can indicate that the execution conditions indicated in the condExecutionCond or condExecutionCondPSCell have been fulfilled.
[0083] In certain embodiments / implementations, if the execution conditions associated with PCell (e.g., indicated in the condExecutionCond) are fulfilled / satisfied first, the UE can send the indication of PCell to the network. In some implementations, if the execution conditions associated with PSCell (e.g., indicated in the condExecutionCondPSCell) are fulfilled / satisfied first, the UE can send the indication of PSCell to the network.
[0084] In certain embodiments / implementations, if the execution conditions associated with PCell are fulfilled / satisfied at time point 1 and the execution conditions associated with PSCell are fulfilled at time point 2, the UE can send the elapsed time between time point 1 and time point 2 to the network.
[0085] In certain embodiments / implementations, if the execution conditions associated with PCell are fulfilled at time point 1, the UE can send the elapsed time between time point 1 and the reception of the last conditionalReconfiguration message. In some implementations, the last conditionalReconfiguration can include the condExecutionCond information.
[0086] In certain embodiments / implementations, if the execution conditions associated with PSCell are fulfilled / satisfied at time point 2, the UE can send the elapsed time between time point 2 and the reception of the last conditionalReconfiguration message. In some implementations, the last conditionalReconfiguration can include the condExecutionCondPSCell information.
[0087] In certain embodiments / implementations, if the execution conditions associated with PCell and PSCell are fulfilled / satisfied at time point 3, the UE can send the elapsed time between time point 3 and the reception of the last conditionalReconfiguration message. In some implementations, the last conditionalReconfiguration can include the condExecutionCond and / or condExecutionCondPSCell information.
[0088] In certain implementations, if the network wants to know / determine the CHO configuration and execution situation of the UE, the network can send the UEInformationRequest to retrieve information from the UE. In some implementations, the UEInformationRequest can include at least one of the following:
[0089] ● A list of {PCell + PSCell} to be evaluated or a list of candidate cells for performing CHO with an SN node. In certain implementations, each set of {PCell + PSCell} can be associated with an index.
[0090] ● A common evaluation condition (s) used for both candidate PCell and PSCell;
[0091] ● A first evaluation condition (s) used for the candidate PCell;
[0092] ● A second evaluation condition (s) used for the candidate PSCell; and / or
[0093] ● A third evaluation condition (s) used for a dedicated candidate PCell or PSCell.
[0094] In certain implementations, the UE can perform evaluations for all the configured candidate PCell or PSCell based on the associated evaluation condition (s) . In some implementations, if the evaluation condition (s) are met / satisfied, the UE can report the candidate PCell or PSCell, for which the associated evaluation condition (s) have been met / satisfied, to the network.
[0095] In certain embodiments / implementations, the UE can perform evaluations for all the configured candidate PCell or PSCell based on the associated evaluation condition (s) . In some implementations, for one set of {PCell + PSCell} , if the PCell and the PSCell meet / satisfy the evaluation condition (s) , the UE can report the corresponding / associated set of {PCell + PSCell} to the network. In some implementations, the UE can report the index of the corresponding / associated set of {PCell + PSCell} to the network.
[0096] In certain embodiments / implementations, the UE can determine the evaluation condition (s) or perform evaluations for each candidate PCell and PSCell. In some implementations, if the evaluation condition (s) for candidate PCell-x and candidate PSCell-y are met / satisfied at the same time (e.g., at the same time point or for the same time duration) , the UE can report the corresponding / associated set of {PCell-x + PSCell-y} to the network.
[0097] Referring now to FIG. 3, which illustrates a flow diagram of a method 300 for optimizing user equipment assistant conditional handover. The method 300 may be implemented using any of the components and devices detailed herein in conjunction with FIGS. 1–2. In an overview, the method 300 may include a wireless communication device receiving report configuration information from a network (STEP 302) . The method may include the wireless communication device sending a report regarding a conditional handover procedure based on the report configuration information to the network (STEP 304) . The method may include the network sending report configuration information to the wireless communication device (STEP 306) . The method may include the network receiving a report regarding a conditional handover procedure based on the report configuration information from the wireless communication device (STEP 308) .
[0098] In certain configurations, a wireless communication device (e.g., UE) can receive / acquire / obtain report configuration information from a network (STEP 302) . The wireless communication device can send / transmit / provide a report regarding a conditional handover procedure based on the report configuration information to the network (STEP 304) . In certain configurations, the report configuration information can indicate a threshold percentage of a timer. In certain configurations, the threshold percentage of the timer can be associated with a master node (MN) , a secondary node (SN) , or both the MN and SN.
[0099] In certain configurations, the report can include at least one of the following: measurement results for neighboring cells; a cell ID of a source MCG or SCG when performing a handover or cell change procedure; a cell ID of a target MCG or SCG when performing a handover or cell change procedure; and / or an amount of time elapsed from initiation of a last conditional reconfiguration execution towards a target cell and reception of the latest conditional reconfiguration for the target cell.
[0100] In certain configurations, when a ratio of the amount of elapsed time associated with the MN to a configured value of the timer associated with the MN is greater than the threshold percentage of the timer associated with the MN, the report can include an indication of the MN. In certain configurations, when a ratio of the amount of elapsed time associated with the SN to a configured value of the timer associated with the SN is greater than the threshold percentage of the timer associated with the SN, the report can include an indication of the SN.
[0101] In certain configurations, the report can include a list of candidate target cells for the conditional handover procedure with one or more SCGs. In certain configurations, the report can include an indication of whether one or more execution conditions associated with each cell have been met / satisfied for each candidate cell. In certain configurations, the report can further include one or more execution conditions associated with a PCell and one or more execution conditions associated with a PSCell.
[0102] In certain configurations, when an execution condition associated with a PCell or associated with a PSCell is fulfilled while detecting a link failure, the configuration / arrangement can further include at least one of the following: the wireless communication device sending an indication of the PCell if an execution condition associated with the PCell is fulfilled first to the network; or the wireless communication device sending an indication of the PSCell if an execution condition associated with the PSCell is fulfilled first to the network.
[0103] In certain configurations, when an execution condition associated with a PCell is fulfilled at a first time point, the configuration / arrangement can further include the wireless communication device sending an amount of elapsed time between the first time point and reception of a last conditionalReconfiguration message to the network. In some implementations, the last conditionalReconfiguration message can include the execution condition associated with the PCell. In certain configurations, when an execution condition associated with a PSCell is fulfilled at a second time point, the configuration / arrangement can further include the wireless communication device sending an amount of elapsed time between the second time point and reception of a last conditionalReconfiguration message to the network. In some implementations, the last conditionalReconfiguration message can include the execution condition associated with the PSCell.
[0104] In certain configurations, when one or more execution conditions associated with a PCell and one or more execution conditions associated with a PSCell are both fulfilled at a third time point, the configuration / arrangement can further include the wireless communication device sending an amount of elapsed time between the third time point and reception of a last conditionalReconfiguration message to the network. In some implementations, the last conditionalReconfiguration message can include the execution conditions associated with the PCell and the PSCell. In certain configurations, when one or more execution conditions associated with a PCell are fulfilled at a first time point and one or more execution conditions associated with a PSCell are fulfilled at a second time point, the configuration / arrangement can further include the wireless communication device sending an amount of elapsed time between the first time point and the second time point to the network.
[0105] In certain configurations, the wireless communication device can receive UEInformationRequest from the network. In some implementations, the UEInformationRequest can include at least one of the following: a list of PCells and PSCells that are available for performing the conditional handover procedure with an SN; an evaluation condition used for both candidate PCells and PSCells; a first evaluation condition used for a candidate PCell; a second evaluation condition used for a candidate PSCell; and / or a third evaluation condition used for a dedicated candidate PCell list or PSCell list.
[0106] In certain configurations, the wireless communication device can determine whether any of the evaluation conditions have been met / satisfied. In some implementations, the report can include a candidate PCell and / or PSCell that has the corresponding evaluation condition met / satisfied.
[0107] At least one aspect is directed to a system, method, apparatus, or a computer-readable medium. In certain configurations, the network can send the report configuration information to the wireless communication device (STEP 306) . In certain configurations, the network can receive a report regarding a conditional handover procedure based on the report configuration information from the wireless communication device (STEP 308) .
[0108] While various embodiments / implementations of the present solution have been described above, it should be understood that they have been presented by way of example only, and not by way of limitation. Likewise, the various diagrams may depict an example architecture or configuration, which are provided to enable persons of ordinary skill in the art to understand example features and functions of the present solution. Such persons would understand, however, that the solution is not restricted to the illustrated example architectures or configurations but can be implemented using a variety of alternative architectures and configurations. Additionally, as would be understood by persons of ordinary skill in the art, one or multiple features of one embodiment / implementation can be combined with one or multiple features of another embodiment / implementation described herein. Thus, the breadth and scope of the present disclosure should not be limited by any of the above-described illustrative embodiments.
[0109] It is also understood that any reference to an element herein using a designation such as “first, ” “second, ” and so forth does not generally limit the quantity or order of those elements. Rather, these designations can be used herein as a convenient means of distinguishing between two or more elements or instances of an element. Thus, a reference to first and second elements does not mean that only two elements can be employed, or that the first element must precede the second element in some manner.
[0110] Additionally, a person having ordinary skill in the art would understand that information and signals can be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, and symbols, which may be referenced in the above description, can be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
[0111] A person of ordinary skill in the art would further appreciate that any of the various illustrative logical blocks, modules, processors, means, circuits, methods and functions described in connection with the aspects disclosed herein can be implemented by electronic hardware (e.g., a digital implementation, an analog implementation, or a combination of the two) , firmware, various forms of program or design code incorporating instructions (which can be referred to herein, for convenience, as “software” or a “software module) , or any combination of these techniques. To clearly illustrate this interchangeability of hardware, firmware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware, firmware or software, or a combination of these techniques, depends upon the particular application and design constraints imposed on the overall system. Skilled artisans can implement the described functionality in various ways for each particular application, but such implementation decisions do not cause a departure from the scope of the present disclosure.
[0112] Furthermore, a person of ordinary skill in the art would understand that various illustrative logical blocks, modules, devices, components, and circuits described herein can be implemented within or performed by an integrated circuit (IC) that can include a general purpose processor, a digital signal processor (DSP) , an application specific integrated circuit (ASIC) , a field programmable gate array (FPGA) or other programmable logic device, or any combination thereof. The logical blocks, modules, and circuits can further include antennas and / or transceivers to communicate with various components within the network or within the device. A general purpose processor can be a microprocessor, but in the alternative, the processor can be any conventional processor, controller, or state machine. A processor can also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or multiple microprocessors in conjunction with a DSP core, or any other suitable configuration to perform the functions described herein.
[0113] If implemented in software, the functions can be stored as one or multiple instructions or code on a computer-readable medium. Thus, the steps of a method or algorithm disclosed herein can be implemented as software stored on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that can be enabled to transfer a computer program or code from one place to another. A storage media can be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired program code in the form of instructions or data structures and that can be accessed by a computer.
[0114] In this document, the term “module” as used herein, refers to software, firmware, hardware, and any combination of these elements for performing the associated functions described herein. Additionally, for purpose of discussion, the various modules are described as discrete modules; however, as would be apparent to one of ordinary skill in the art, two or more modules may be combined to form a single module that performs the associated functions according to embodiments of the present solution.
[0115] Additionally, memory or other storage, as well as communication components, may be employed in embodiments of the present solution. It will be appreciated that, for clarity purposes, the above description has described embodiments of the present solution with reference to different functional units and processors. However, it will be apparent that any suitable distribution of functionality between different functional units, processing logic elements or domains may be used without detracting from the present solution. For example, functionality illustrated to be performed by separate processing logic elements, or controllers, may be performed by the same processing logic element, or controller. Hence, references to specific functional units are only references to a suitable means for providing the described functionality, rather than indicative of a strict logical or physical structure or organization.
[0116] Various modifications to the embodiments described in this disclosure will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the scope of this disclosure. Thus, the disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the novel features and principles disclosed herein, as recited in the claims below.
Claims
1.A wireless communication method, comprising:receiving, by a wireless communication device from a network, report configuration information; andsending, by the wireless communication device to the network, a report regarding a conditional handover procedure based on the report configuration information.2.The wireless communication method of claim 1, wherein the report configuration information indicates a threshold percentage of a timer.3.The wireless communication method of claim 2, wherein the threshold percentage of the timer is associated with a master node (MN) , a secondary node (SN) , or both the MN and SN.4.The wireless communication method of claim 2, wherein the report includes at least one of: measurement results for neighboring cells; a cell ID of a source MCG or SCG when performing a handover or cell change procedure; a cell ID of a target MCG or SCG when performing a handover or cell change procedure; or an amount of time elapsed from initiation of a last conditional reconfiguration execution towards a target cell and reception of the latest conditional reconfiguration for the target cell.5.The wireless communication method of claim 4, wherein when a ratio of the amount of elapsed time associated with the MN to a configured value of the timer associated with the MN is greater than the threshold percentage of the timer associated with the MN, the report includes an indication of the MN.6.The wireless communication method of claim 4, wherein when a ratio of the amount of elapsed time associated with the SN to a configured value of the timer associated with the SN is greater than the threshold percentage of the timer associated with the SN, the report includes an indication of the SN.7.The wireless communication method of claim 1, wherein the report includes a list of candidate target cells for the conditional handover procedure with one or more SCGs.8.The wireless communication method of claim 1, wherein the report includes an indication of whether one or more execution conditions associated with each cell are met for each candidate cell.9.The wireless communication method of claim 1, wherein the report further includes one or more execution conditions associated with a PCell and one or more execution conditions associated with a PSCell.10.The wireless communication method of claim 1, wherein when an execution condition associated with a PCell or associated with a PSCell is fulfilled while detecting a link failure, the method further comprises:sending, by the wireless communication device to the network, an indication of the PCell if an execution condition associated with the PCell is fulfilled first; orsending, by the wireless communication device to the network, an indication of the PSCell if an execution condition associated with the PSCell is fulfilled first.11.The wireless communication method of claim 7, wherein when an execution condition associated with a PCell is fulfilled at a first time point, the method further comprises:sending, by the wireless communication device to the network, an amount of elapsed time between the first time point and reception of a last conditionalReconfiguration message, wherein the last conditionalReconfiguration message includes the execution condition associated with the PCell.12.The wireless communication method of claim 7, wherein when an execution condition associated with a PSCell is fulfilled at a second time point, the method further comprises:sending, by the wireless communication device to the network, an amount of elapsed time between the second time point and reception of a last conditionalReconfiguration message, wherein the last conditionalReconfiguration message includes the execution condition associated with the PSCell.13.The wireless communication method of claim 7, wherein when one or more execution conditions associated with a PCell and one or more execution conditions associated with a PSCell are both fulfilled at a third time point, the method further comprises:sending, by the wireless communication device to the network, an amount of elapsed time between the third time point and reception of a last conditionalReconfiguration message, wherein the last conditionalReconfiguration message includes the execution conditions associated with the PCell and the PSCell.14.The wireless communication method of claim 7, wherein when one or more execution conditions associated with a PCell are fulfilled at a first time point and one or more execution conditions associated with a PSCell are fulfilled at a second time point, the method further comprises:sending, by the wireless communication device to the network, an amount of elapsed time between the first time point and the second time point.15.The wireless communication method of claim 7, the report can include a list of candidate target PCells and PSCells, each candidate target PCell is associated to one or more candidate target PSCells.16.The wireless communication method of claim 15, in response to any of candidate cell meets the execution condition, the report can include at least one of: indication of whether the execution condition (s) are met for each candidate cell or not; or a list of candidate target PCells or PSCells which meets the execution condition.17.The wireless communication method of claim 1, wherein the report further includes a PSCell ID, the PSCell ID indicate at least one of the following: the PSCell in which the UE failed to perform fast MCG recovery procedure; the PSCell in which the UE successfully performed fast MCG recovery procedure; the PSCell in which the RLF is detected; the PSCell in which the target PSCell of the failed handover; the PSCell to which UE is connected when the RLF or failed handover is detected in the PCell; the PSCell in which the target PSCell of the successful handover or no RLF.18.The wireless communication method of claim 17, wherein the report further includes at least one of the following: a measurement results for neighboring cells of the PSCell ; the failure cause of the PSCell; the successful indication of the PSCell.19.The wireless communication method of claim 17, the report can further include a container ofSCGFailureInformation message which is used to provide information regarding SCG failures detected by the UE.20.A wireless communication method, comprising:receiving, by the wireless communication device from the network, report Request;wherein the report Request includes at least one of: a list of PCells and PSCells that are available forperforming the conditional handover procedure with an SN; an evaluation condition used for both candidate PCellsand PSCells; a first evaluation condition used for a candidate PCell; a second evaluation condition used for acandidate PSCell; a third evaluation condition used for a dedicated candidate PCell list or PSCell list.21.The wireless communication method of claim 20, further comprising:determining, by the wireless communication device, whether any of the evaluation conditions is met;wherein the report includes a candidate PCell and / or PSCell that has the corresponding evaluation conditionmet.22.A wireless communications apparatus comprising a processor and a memory, wherein the processor isconfigured to read code from the memory and implement a method recited in any of claims 1 to 21.23.A computer program product comprising a computer-readable program medium code stored thereupon, the code,when executed by a processor, causing the processor to implement a method recited in any of claims 1 to 21.
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